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We looked at the chance and variable of picking up the same marble twice. When we look at the random 10 marbles we got, we looked at the colour that had the most marbles and the colour that had the least marbles and tried to keep them the same. There has to be at least one marble for each colour. A formula we used was the number of marbles take away the chance that they were picked up twice. To guess this chance of getting picked up twice we looked at the percentage of the colour and others.